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Topic: What caused this failure? (Read 952 times)

Yesterday I started the printer printing and went to work. When I came home it had mostly printed and then failed. I’ve had a couple of failures where the parts never attach to the build plate, I’ve fixed this by relevelling the plate and cleaning the cured resin off the bottom of the vat. But this seems different somehow. I’m wondering if I need to change the film on the bottom, it’s the original one and I’ve done a good amount of printing with it. What do you think?

Hard to say, really. Just examining the picture it looks like it failed in the center of the build plate early on, then as the model grew the weight that was being supported by the outer sides eventually pulled it off the plate. When your vat is completely clean does the center of your FEP look worse than the perimeters? Same question for the build plate. Is this a one time failure or do you see this time and again? Try moving your models either forward or rearward to see if that affects adhesion to the plate. It may be the center of your FEP is worn out and not releasing as easily as it used to. Let us know what all you try so we can learn from this particular type of failure.

I don't think that's related to a FEP issue. If a spot is worn in the FEP, you'll know it; it looks like a hole was torn through the print where that spot is. On that topic, you can feel the texture difference between good and bad FEP, even through the Nitrile glove in a vat full of resin. Good FEP is smooth and slick, anything else is bad. Since FEP doesn't wear out all at once, you'll be able to feel any 'dull' spots from the surrounding slick film.

Back to your print. It does seem like something happened from the center out. It's almost like the opposite of a 'hot spot', where you'd normally expect the edges to fail as the UV intensity falls off. But, looking at your platforms, it could simply be part orientation. And I wonder if there is just not enough platform to begin with.

Clean up the part and let's see the full aftermath. That will help us understand the root cause.

What are your base layer exposure settings? The very first time I printed with my printer, it was the Anycubic lattice cube, and it failed immediately. I had used the default 8 layers at 40 seconds each (0.05mm layers). After that, I've used 8x80 seconds, and never had a print detach from the build plate since.

What are your base layer exposure settings? The very first time I printed with my printer, it was the Anycubic lattice cube, and it failed immediately. I had used the default 8 layers at 40 seconds each (0.05mm layers). After that, I've used 8x80 seconds, and never had a print detach from the build plate since.

I don’t remember off the top of my head, but something like 100 seconds.

I don't think that's related to a FEP issue. If a spot is worn in the FEP, you'll know it; it looks like a hole was torn through the print where that spot is. On that topic, you can feel the texture difference between good and bad FEP, even through the Nitrile glove in a vat full of resin. Good FEP is smooth and slick, anything else is bad. Since FEP doesn't wear out all at once, you'll be able to feel any 'dull' spots from the surrounding slick film.

Back to your print. It does seem like something happened from the center out. It's almost like the opposite of a 'hot spot', where you'd normally expect the edges to fail as the UV intensity falls off. But, looking at your platforms, it could simply be part orientation. And I wonder if there is just not enough platform to begin with.

Clean up the part and let's see the full aftermath. That will help us understand the root cause.

I’ll clean it off in the morning and post a picture. It may have failed in the middle, but it is two separate parts in one file. The reason I was wondering about the film is that it seems to have started fine, but then something pulled them down a bit, or something like that. Both of these parts have printed fine on their own with similar platforms. But this time I had a problem.

Depending on the size of the print, the webcam may never actually see anything with an Anycubic Photon. In some of my prints, the first 2 hours the build plate barely reaches the lip of the vat meaning the print is obscured from view.